#pragma once

#include "config.hpp"
#include "hardware.hpp"

#define FORCE_INLINE __attribute__((always_inline))

namespace uart {

namespace detail {

#if defined(__AVR_ATmega1284P__)

struct Registers0 {
	static constexpr volatile auto *IO_REG = &UDR0;
	static constexpr volatile auto *CTRL_STAT_REG_A = &UCSR0A;
	static constexpr volatile auto *CTRL_STAT_REG_B = &UCSR0B;
	static constexpr volatile auto *CTRL_STAT_REG_C = &UCSR0C;
	static constexpr volatile auto *BAUD_REG_L = &UBRR0L;
	static constexpr volatile auto *BAUD_REG_H = &UBRR0H;
};

enum class ControlFlagsA0 {
	MULTI_PROC_COMM_MODE = MPCM0,
	SPEED_2X = U2X0,
	PARITY_ERROR = UPE0,
	DATA_OVER_RUN = DOR0,
	FRAME_ERROR = FE0,
	DATA_REG_EMPTY = UDRE0,
	TRANSMIT_COMPLETE = TXC0,
	RECEIVE_COMPLETE = RXC0,
};

enum class ControlFlagsB0 {
	TX_DATA_BIT_8 = TXB80,
	RX_DATA_BIT_8 = RXB80,
	CHAR_SIZE_2 = UCSZ02,
	TX_ENABLE = TXEN0,
	RX_ENABLE = RXEN0,
	DATA_REG_EMPTY_INT_ENABLE = UDRIE0,
	TX_INT_ENABLE = TXCIE0,
	RX_INT_ENABLE = RXCIE0,
};

enum class ControlFlagsC0 {
	CLK_POLARITY = UCPOL0,
	CHAR_SIZE_0 = UCSZ00,
	CHAR_SIZE_1 = UCSZ01,
	STOP_BIT_SEL = USBS0,
	PARITY_MODE_0 = UPM00,
	PARITY_MODE_1 = UPM01,
	MODE_SEL_0 = UMSEL00,
	MODE_SEL_1 = UMSEL01,
};

// clang-format off
constexpr int operator<<(const int &lhs, const ControlFlagsA0 &rhs) { return lhs << static_cast<int>(rhs); }
constexpr int operator<<(const int &lhs, const ControlFlagsB0 &rhs) { return lhs << static_cast<int>(rhs); }
constexpr int operator<<(const int &lhs, const ControlFlagsC0 &rhs) { return lhs << static_cast<int>(rhs); }
// clang-format on

static void (*fnDataReg0EmptyIntHandler)() = nullptr;
static void (*fnRx0IntHandler)() = nullptr;
static void (*fnTx0IntHandler)() = nullptr;

ISR(USART0_UDRE_vect)
{
	if (fnDataReg0EmptyIntHandler)
		fnDataReg0EmptyIntHandler();
}

ISR(USART0_RX_vect)
{
	if (fnRx0IntHandler)
		fnRx0IntHandler();
}

ISR(USART0_TX_vect)
{
	if (fnTx0IntHandler)
		fnTx0IntHandler();
}

#else
#error "This chip is not supported"
#endif

} // namespace detail

template <Mode mode = Mode::ASYNCHRONOUS, class cfg = Config<>, Driven driven = Driven::INTERRUPT>
class Hardware0 {
  public:
	using data_t = typename cfg::data_t;
	static constexpr auto DATA_BITS = cfg::DATA_BITS;

	static void init() FORCE_INLINE
	{
		HardwareImpl::init();
	}

	static void txByte(data_t byte) FORCE_INLINE
	{
		HardwareImpl::txByteBlocking(byte);
	}

	static data_t rxByte() FORCE_INLINE {}

	static data_t peek() FORCE_INLINE {}

  private:
	using HardwareImpl = detail::Hardware<detail::Registers0, detail::ControlFlagsA0, detail::ControlFlagsB0,
	                                      detail::ControlFlagsC0, cfg, mode, driven>;
};

template <Mode mode, class cfg>
class Hardware0<mode, cfg, Driven::INTERRUPT> {
  public:
	using data_t = typename cfg::data_t;
	static constexpr auto DATA_BITS = cfg::DATA_BITS;

	static void init() FORCE_INLINE
	{
		detail::fnDataReg0EmptyIntHandler = dataRegEmptyIntHandler;
		detail::fnRx0IntHandler = rxIntHandler;
		detail::fnTx0IntHandler = txIntHandler;

		HardwareImpl::init();
	}

	static void txByte(data_t byte) FORCE_INLINE
	{
		HardwareImpl::txByteBlocking(byte);
	}

	static data_t rxByte() FORCE_INLINE {}

	static data_t peek() FORCE_INLINE {}

  private:
	using HardwareImpl = detail::Hardware<detail::Registers0, detail::ControlFlagsA0, detail::ControlFlagsB0,
	                                      detail::ControlFlagsC0, cfg, mode, Driven::INTERRUPT>;

	static void dataRegEmptyIntHandler()
	{
		// TODO
	}

	static void rxIntHandler()
	{
		// TODO
	}

	static void txIntHandler()
	{
		// TODO
	}
};

} // namespace uart

#undef FORCE_INLINE